/* imail.c - Handles Intelligent Mail (aka OneCode) for USPS */

/*
    libzint - the open source barcode library
    Copyright (C) 2008 Robin Stuart <robin@zint.org.uk>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

/*  The function "USPS_MSB_Math_CRC11GenerateFrameCheckSequence"
    is Copyright (C) 2006 United States Postal Service */

static short int BCD[40] = {
	0, 0, 0, 0,
	1, 0, 0, 0,
	0, 1, 0, 0,
	1, 1, 0, 0,
	0, 0, 1, 0,
	1, 0, 1, 0,
	0, 1, 1, 0,
	1, 1, 1, 0,
	0, 0, 0, 1,
	1, 0, 0, 1
};

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "common.h"
#include "large.h"

#define SODIUM	"0123456789-"

/* The following lookup tables were generated using the code in Appendix C */
	
static unsigned short AppxD_I[1287] = { /* Appendix D Table 1 - 5 of 13 characters */
	0x001F, 0x1F00, 0x002F, 0x1E80, 0x0037, 0x1D80, 0x003B, 0x1B80, 0x003D, 0x1780, 
	0x003E, 0x0F80, 0x004F, 0x1E40, 0x0057, 0x1D40, 0x005B, 0x1B40, 0x005D, 0x1740, 
	0x005E, 0x0F40, 0x0067, 0x1CC0, 0x006B, 0x1AC0, 0x006D, 0x16C0, 0x006E, 0x0EC0, 
	0x0073, 0x19C0, 0x0075, 0x15C0, 0x0076, 0x0DC0, 0x0079, 0x13C0, 0x007A, 0x0BC0, 
	0x007C, 0x07C0, 0x008F, 0x1E20, 0x0097, 0x1D20, 0x009B, 0x1B20, 0x009D, 0x1720, 
	0x009E, 0x0F20, 0x00A7, 0x1CA0, 0x00AB, 0x1AA0, 0x00AD, 0x16A0, 0x00AE, 0x0EA0, 
	0x00B3, 0x19A0, 0x00B5, 0x15A0, 0x00B6, 0x0DA0, 0x00B9, 0x13A0, 0x00BA, 0x0BA0, 
	0x00BC, 0x07A0, 0x00C7, 0x1C60, 0x00CB, 0x1A60, 0x00CD, 0x1660, 0x00CE, 0x0E60, 
	0x00D3, 0x1960, 0x00D5, 0x1560, 0x00D6, 0x0D60, 0x00D9, 0x1360, 0x00DA, 0x0B60, 
	0x00DC, 0x0760, 0x00E3, 0x18E0, 0x00E5, 0x14E0, 0x00E6, 0x0CE0, 0x00E9, 0x12E0, 
	0x00EA, 0x0AE0, 0x00EC, 0x06E0, 0x00F1, 0x11E0, 0x00F2, 0x09E0, 0x00F4, 0x05E0, 
	0x00F8, 0x03E0, 0x010F, 0x1E10, 0x0117, 0x1D10, 0x011B, 0x1B10, 0x011D, 0x1710, 
	0x011E, 0x0F10, 0x0127, 0x1C90, 0x012B, 0x1A90, 0x012D, 0x1690, 0x012E, 0x0E90, 
	0x0133, 0x1990, 0x0135, 0x1590, 0x0136, 0x0D90, 0x0139, 0x1390, 0x013A, 0x0B90, 
	0x013C, 0x0790, 0x0147, 0x1C50, 0x014B, 0x1A50, 0x014D, 0x1650, 0x014E, 0x0E50, 
	0x0153, 0x1950, 0x0155, 0x1550, 0x0156, 0x0D50, 0x0159, 0x1350, 0x015A, 0x0B50, 
	0x015C, 0x0750, 0x0163, 0x18D0, 0x0165, 0x14D0, 0x0166, 0x0CD0, 0x0169, 0x12D0, 
	0x016A, 0x0AD0, 0x016C, 0x06D0, 0x0171, 0x11D0, 0x0172, 0x09D0, 0x0174, 0x05D0, 
	0x0178, 0x03D0, 0x0187, 0x1C30, 0x018B, 0x1A30, 0x018D, 0x1630, 0x018E, 0x0E30, 
	0x0193, 0x1930, 0x0195, 0x1530, 0x0196, 0x0D30, 0x0199, 0x1330, 0x019A, 0x0B30, 
	0x019C, 0x0730, 0x01A3, 0x18B0, 0x01A5, 0x14B0, 0x01A6, 0x0CB0, 0x01A9, 0x12B0, 
	0x01AA, 0x0AB0, 0x01AC, 0x06B0, 0x01B1, 0x11B0, 0x01B2, 0x09B0, 0x01B4, 0x05B0, 
	0x01B8, 0x03B0, 0x01C3, 0x1870, 0x01C5, 0x1470, 0x01C6, 0x0C70, 0x01C9, 0x1270, 
	0x01CA, 0x0A70, 0x01CC, 0x0670, 0x01D1, 0x1170, 0x01D2, 0x0970, 0x01D4, 0x0570, 
	0x01D8, 0x0370, 0x01E1, 0x10F0, 0x01E2, 0x08F0, 0x01E4, 0x04F0, 0x01E8, 0x02F0, 
	0x020F, 0x1E08, 0x0217, 0x1D08, 0x021B, 0x1B08, 0x021D, 0x1708, 0x021E, 0x0F08, 
	0x0227, 0x1C88, 0x022B, 0x1A88, 0x022D, 0x1688, 0x022E, 0x0E88, 0x0233, 0x1988, 
	0x0235, 0x1588, 0x0236, 0x0D88, 0x0239, 0x1388, 0x023A, 0x0B88, 0x023C, 0x0788, 
	0x0247, 0x1C48, 0x024B, 0x1A48, 0x024D, 0x1648, 0x024E, 0x0E48, 0x0253, 0x1948, 
	0x0255, 0x1548, 0x0256, 0x0D48, 0x0259, 0x1348, 0x025A, 0x0B48, 0x025C, 0x0748, 
	0x0263, 0x18C8, 0x0265, 0x14C8, 0x0266, 0x0CC8, 0x0269, 0x12C8, 0x026A, 0x0AC8, 
	0x026C, 0x06C8, 0x0271, 0x11C8, 0x0272, 0x09C8, 0x0274, 0x05C8, 0x0278, 0x03C8, 
	0x0287, 0x1C28, 0x028B, 0x1A28, 0x028D, 0x1628, 0x028E, 0x0E28, 0x0293, 0x1928, 
	0x0295, 0x1528, 0x0296, 0x0D28, 0x0299, 0x1328, 0x029A, 0x0B28, 0x029C, 0x0728, 
	0x02A3, 0x18A8, 0x02A5, 0x14A8, 0x02A6, 0x0CA8, 0x02A9, 0x12A8, 0x02AA, 0x0AA8, 
	0x02AC, 0x06A8, 0x02B1, 0x11A8, 0x02B2, 0x09A8, 0x02B4, 0x05A8, 0x02B8, 0x03A8, 
	0x02C3, 0x1868, 0x02C5, 0x1468, 0x02C6, 0x0C68, 0x02C9, 0x1268, 0x02CA, 0x0A68, 
	0x02CC, 0x0668, 0x02D1, 0x1168, 0x02D2, 0x0968, 0x02D4, 0x0568, 0x02D8, 0x0368, 
	0x02E1, 0x10E8, 0x02E2, 0x08E8, 0x02E4, 0x04E8, 0x0307, 0x1C18, 0x030B, 0x1A18, 
	0x030D, 0x1618, 0x030E, 0x0E18, 0x0313, 0x1918, 0x0315, 0x1518, 0x0316, 0x0D18, 
	0x0319, 0x1318, 0x031A, 0x0B18, 0x031C, 0x0718, 0x0323, 0x1898, 0x0325, 0x1498, 
	0x0326, 0x0C98, 0x0329, 0x1298, 0x032A, 0x0A98, 0x032C, 0x0698, 0x0331, 0x1198, 
	0x0332, 0x0998, 0x0334, 0x0598, 0x0338, 0x0398, 0x0343, 0x1858, 0x0345, 0x1458, 
	0x0346, 0x0C58, 0x0349, 0x1258, 0x034A, 0x0A58, 0x034C, 0x0658, 0x0351, 0x1158, 
	0x0352, 0x0958, 0x0354, 0x0558, 0x0361, 0x10D8, 0x0362, 0x08D8, 0x0364, 0x04D8, 
	0x0383, 0x1838, 0x0385, 0x1438, 0x0386, 0x0C38, 0x0389, 0x1238, 0x038A, 0x0A38, 
	0x038C, 0x0638, 0x0391, 0x1138, 0x0392, 0x0938, 0x0394, 0x0538, 0x03A1, 0x10B8, 
	0x03A2, 0x08B8, 0x03A4, 0x04B8, 0x03C1, 0x1078, 0x03C2, 0x0878, 0x03C4, 0x0478, 
	0x040F, 0x1E04, 0x0417, 0x1D04, 0x041B, 0x1B04, 0x041D, 0x1704, 0x041E, 0x0F04, 
	0x0427, 0x1C84, 0x042B, 0x1A84, 0x042D, 0x1684, 0x042E, 0x0E84, 0x0433, 0x1984, 
	0x0435, 0x1584, 0x0436, 0x0D84, 0x0439, 0x1384, 0x043A, 0x0B84, 0x043C, 0x0784, 
	0x0447, 0x1C44, 0x044B, 0x1A44, 0x044D, 0x1644, 0x044E, 0x0E44, 0x0453, 0x1944, 
	0x0455, 0x1544, 0x0456, 0x0D44, 0x0459, 0x1344, 0x045A, 0x0B44, 0x045C, 0x0744, 
	0x0463, 0x18C4, 0x0465, 0x14C4, 0x0466, 0x0CC4, 0x0469, 0x12C4, 0x046A, 0x0AC4, 
	0x046C, 0x06C4, 0x0471, 0x11C4, 0x0472, 0x09C4, 0x0474, 0x05C4, 0x0487, 0x1C24, 
	0x048B, 0x1A24, 0x048D, 0x1624, 0x048E, 0x0E24, 0x0493, 0x1924, 0x0495, 0x1524, 
	0x0496, 0x0D24, 0x0499, 0x1324, 0x049A, 0x0B24, 0x049C, 0x0724, 0x04A3, 0x18A4, 
	0x04A5, 0x14A4, 0x04A6, 0x0CA4, 0x04A9, 0x12A4, 0x04AA, 0x0AA4, 0x04AC, 0x06A4, 
	0x04B1, 0x11A4, 0x04B2, 0x09A4, 0x04B4, 0x05A4, 0x04C3, 0x1864, 0x04C5, 0x1464, 
	0x04C6, 0x0C64, 0x04C9, 0x1264, 0x04CA, 0x0A64, 0x04CC, 0x0664, 0x04D1, 0x1164, 
	0x04D2, 0x0964, 0x04D4, 0x0564, 0x04E1, 0x10E4, 0x04E2, 0x08E4, 0x0507, 0x1C14, 
	0x050B, 0x1A14, 0x050D, 0x1614, 0x050E, 0x0E14, 0x0513, 0x1914, 0x0515, 0x1514, 
	0x0516, 0x0D14, 0x0519, 0x1314, 0x051A, 0x0B14, 0x051C, 0x0714, 0x0523, 0x1894, 
	0x0525, 0x1494, 0x0526, 0x0C94, 0x0529, 0x1294, 0x052A, 0x0A94, 0x052C, 0x0694, 
	0x0531, 0x1194, 0x0532, 0x0994, 0x0534, 0x0594, 0x0543, 0x1854, 0x0545, 0x1454, 
	0x0546, 0x0C54, 0x0549, 0x1254, 0x054A, 0x0A54, 0x054C, 0x0654, 0x0551, 0x1154, 
	0x0552, 0x0954, 0x0561, 0x10D4, 0x0562, 0x08D4, 0x0583, 0x1834, 0x0585, 0x1434, 
	0x0586, 0x0C34, 0x0589, 0x1234, 0x058A, 0x0A34, 0x058C, 0x0634, 0x0591, 0x1134, 
	0x0592, 0x0934, 0x05A1, 0x10B4, 0x05A2, 0x08B4, 0x05C1, 0x1074, 0x05C2, 0x0874, 
	0x0607, 0x1C0C, 0x060B, 0x1A0C, 0x060D, 0x160C, 0x060E, 0x0E0C, 0x0613, 0x190C, 
	0x0615, 0x150C, 0x0616, 0x0D0C, 0x0619, 0x130C, 0x061A, 0x0B0C, 0x061C, 0x070C, 
	0x0623, 0x188C, 0x0625, 0x148C, 0x0626, 0x0C8C, 0x0629, 0x128C, 0x062A, 0x0A8C, 
	0x062C, 0x068C, 0x0631, 0x118C, 0x0632, 0x098C, 0x0643, 0x184C, 0x0645, 0x144C, 
	0x0646, 0x0C4C, 0x0649, 0x124C, 0x064A, 0x0A4C, 0x0651, 0x114C, 0x0652, 0x094C, 
	0x0661, 0x10CC, 0x0662, 0x08CC, 0x0683, 0x182C, 0x0685, 0x142C, 0x0686, 0x0C2C, 
	0x0689, 0x122C, 0x068A, 0x0A2C, 0x0691, 0x112C, 0x0692, 0x092C, 0x06A1, 0x10AC, 
	0x06A2, 0x08AC, 0x06C1, 0x106C, 0x06C2, 0x086C, 0x0703, 0x181C, 0x0705, 0x141C, 
	0x0706, 0x0C1C, 0x0709, 0x121C, 0x070A, 0x0A1C, 0x0711, 0x111C, 0x0712, 0x091C, 
	0x0721, 0x109C, 0x0722, 0x089C, 0x0741, 0x105C, 0x0742, 0x085C, 0x0781, 0x103C, 
	0x0782, 0x083C, 0x080F, 0x1E02, 0x0817, 0x1D02, 0x081B, 0x1B02, 0x081D, 0x1702, 
	0x081E, 0x0F02, 0x0827, 0x1C82, 0x082B, 0x1A82, 0x082D, 0x1682, 0x082E, 0x0E82, 
	0x0833, 0x1982, 0x0835, 0x1582, 0x0836, 0x0D82, 0x0839, 0x1382, 0x083A, 0x0B82, 
	0x0847, 0x1C42, 0x084B, 0x1A42, 0x084D, 0x1642, 0x084E, 0x0E42, 0x0853, 0x1942, 
	0x0855, 0x1542, 0x0856, 0x0D42, 0x0859, 0x1342, 0x085A, 0x0B42, 0x0863, 0x18C2, 
	0x0865, 0x14C2, 0x0866, 0x0CC2, 0x0869, 0x12C2, 0x086A, 0x0AC2, 0x0871, 0x11C2, 
	0x0872, 0x09C2, 0x0887, 0x1C22, 0x088B, 0x1A22, 0x088D, 0x1622, 0x088E, 0x0E22, 
	0x0893, 0x1922, 0x0895, 0x1522, 0x0896, 0x0D22, 0x0899, 0x1322, 0x089A, 0x0B22, 
	0x08A3, 0x18A2, 0x08A5, 0x14A2, 0x08A6, 0x0CA2, 0x08A9, 0x12A2, 0x08AA, 0x0AA2, 
	0x08B1, 0x11A2, 0x08B2, 0x09A2, 0x08C3, 0x1862, 0x08C5, 0x1462, 0x08C6, 0x0C62, 
	0x08C9, 0x1262, 0x08CA, 0x0A62, 0x08D1, 0x1162, 0x08D2, 0x0962, 0x08E1, 0x10E2, 
	0x0907, 0x1C12, 0x090B, 0x1A12, 0x090D, 0x1612, 0x090E, 0x0E12, 0x0913, 0x1912, 
	0x0915, 0x1512, 0x0916, 0x0D12, 0x0919, 0x1312, 0x091A, 0x0B12, 0x0923, 0x1892, 
	0x0925, 0x1492, 0x0926, 0x0C92, 0x0929, 0x1292, 0x092A, 0x0A92, 0x0931, 0x1192, 
	0x0932, 0x0992, 0x0943, 0x1852, 0x0945, 0x1452, 0x0946, 0x0C52, 0x0949, 0x1252, 
	0x094A, 0x0A52, 0x0951, 0x1152, 0x0961, 0x10D2, 0x0983, 0x1832, 0x0985, 0x1432, 
	0x0986, 0x0C32, 0x0989, 0x1232, 0x098A, 0x0A32, 0x0991, 0x1132, 0x09A1, 0x10B2, 
	0x09C1, 0x1072, 0x0A07, 0x1C0A, 0x0A0B, 0x1A0A, 0x0A0D, 0x160A, 0x0A0E, 0x0E0A, 
	0x0A13, 0x190A, 0x0A15, 0x150A, 0x0A16, 0x0D0A, 0x0A19, 0x130A, 0x0A1A, 0x0B0A, 
	0x0A23, 0x188A, 0x0A25, 0x148A, 0x0A26, 0x0C8A, 0x0A29, 0x128A, 0x0A2A, 0x0A8A, 
	0x0A31, 0x118A, 0x0A43, 0x184A, 0x0A45, 0x144A, 0x0A46, 0x0C4A, 0x0A49, 0x124A, 
	0x0A51, 0x114A, 0x0A61, 0x10CA, 0x0A83, 0x182A, 0x0A85, 0x142A, 0x0A86, 0x0C2A, 
	0x0A89, 0x122A, 0x0A91, 0x112A, 0x0AA1, 0x10AA, 0x0AC1, 0x106A, 0x0B03, 0x181A, 
	0x0B05, 0x141A, 0x0B06, 0x0C1A, 0x0B09, 0x121A, 0x0B11, 0x111A, 0x0B21, 0x109A, 
	0x0B41, 0x105A, 0x0B81, 0x103A, 0x0C07, 0x1C06, 0x0C0B, 0x1A06, 0x0C0D, 0x1606, 
	0x0C0E, 0x0E06, 0x0C13, 0x1906, 0x0C15, 0x1506, 0x0C16, 0x0D06, 0x0C19, 0x1306, 
	0x0C23, 0x1886, 0x0C25, 0x1486, 0x0C26, 0x0C86, 0x0C29, 0x1286, 0x0C31, 0x1186, 
	0x0C43, 0x1846, 0x0C45, 0x1446, 0x0C49, 0x1246, 0x0C51, 0x1146, 0x0C61, 0x10C6, 
	0x0C83, 0x1826, 0x0C85, 0x1426, 0x0C89, 0x1226, 0x0C91, 0x1126, 0x0CA1, 0x10A6, 
	0x0CC1, 0x1066, 0x0D03, 0x1816, 0x0D05, 0x1416, 0x0D09, 0x1216, 0x0D11, 0x1116, 
	0x0D21, 0x1096, 0x0D41, 0x1056, 0x0D81, 0x1036, 0x0E03, 0x180E, 0x0E05, 0x140E, 
	0x0E09, 0x120E, 0x0E11, 0x110E, 0x0E21, 0x108E, 0x0E41, 0x104E, 0x0E81, 0x102E, 
	0x0F01, 0x101E, 0x100F, 0x1E01, 0x1017, 0x1D01, 0x101B, 0x1B01, 0x101D, 0x1701, 
	0x1027, 0x1C81, 0x102B, 0x1A81, 0x102D, 0x1681, 0x1033, 0x1981, 0x1035, 0x1581, 
	0x1039, 0x1381, 0x1047, 0x1C41, 0x104B, 0x1A41, 0x104D, 0x1641, 0x1053, 0x1941, 
	0x1055, 0x1541, 0x1059, 0x1341, 0x1063, 0x18C1, 0x1065, 0x14C1, 0x1069, 0x12C1, 
	0x1071, 0x11C1, 0x1087, 0x1C21, 0x108B, 0x1A21, 0x108D, 0x1621, 0x1093, 0x1921, 
	0x1095, 0x1521, 0x1099, 0x1321, 0x10A3, 0x18A1, 0x10A5, 0x14A1, 0x10A9, 0x12A1, 
	0x10B1, 0x11A1, 0x10C3, 0x1861, 0x10C5, 0x1461, 0x10C9, 0x1261, 0x10D1, 0x1161, 
	0x1107, 0x1C11, 0x110B, 0x1A11, 0x110D, 0x1611, 0x1113, 0x1911, 0x1115, 0x1511, 
	0x1119, 0x1311, 0x1123, 0x1891, 0x1125, 0x1491, 0x1129, 0x1291, 0x1131, 0x1191, 
	0x1143, 0x1851, 0x1145, 0x1451, 0x1149, 0x1251, 0x1183, 0x1831, 0x1185, 0x1431, 
	0x1189, 0x1231, 0x1207, 0x1C09, 0x120B, 0x1A09, 0x120D, 0x1609, 0x1213, 0x1909, 
	0x1215, 0x1509, 0x1219, 0x1309, 0x1223, 0x1889, 0x1225, 0x1489, 0x1229, 0x1289, 
	0x1243, 0x1849, 0x1245, 0x1449, 0x1283, 0x1829, 0x1285, 0x1429, 0x1303, 0x1819, 
	0x1305, 0x1419, 0x1407, 0x1C05, 0x140B, 0x1A05, 0x140D, 0x1605, 0x1413, 0x1905, 
	0x1415, 0x1505, 0x1423, 0x1885, 0x1425, 0x1485, 0x1443, 0x1845, 0x1483, 0x1825, 
	0x1503, 0x1815, 0x1603, 0x180D, 0x1807, 0x1C03, 0x180B, 0x1A03, 0x1813, 0x1903, 
	0x1823, 0x1883, 0x1843, 0x1445, 0x1249, 0x1151, 0x10E1, 0x0C46, 0x0A4A, 0x0952, 
	0x08E2, 0x064C, 0x0554, 0x04E4, 0x0358, 0x02E8, 0x01F0 };

static unsigned short AppxD_II[78] = { /* Appendix D Table II - 2 of 13 characters */
	0x0003, 0x1800, 0x0005, 0x1400, 0x0006, 0x0C00, 0x0009, 0x1200, 0x000A, 0x0A00, 
	0x000C, 0x0600, 0x0011, 0x1100, 0x0012, 0x0900, 0x0014, 0x0500, 0x0018, 0x0300, 
	0x0021, 0x1080, 0x0022, 0x0880, 0x0024, 0x0480, 0x0028, 0x0280, 0x0030, 0x0180, 
	0x0041, 0x1040, 0x0042, 0x0840, 0x0044, 0x0440, 0x0048, 0x0240, 0x0050, 0x0140, 
	0x0060, 0x00C0, 0x0081, 0x1020, 0x0082, 0x0820, 0x0084, 0x0420, 0x0088, 0x0220, 
	0x0090, 0x0120, 0x0101, 0x1010, 0x0102, 0x0810, 0x0104, 0x0410, 0x0108, 0x0210, 
	0x0201, 0x1008, 0x0202, 0x0808, 0x0204, 0x0408, 0x0401, 0x1004, 0x0402, 0x0804, 
	0x0801, 0x1002, 0x1001, 0x0802, 0x0404, 0x0208, 0x0110, 0x00A0 };

static int AppxD_IV[130] = { /* Appendix D Table IV - Bar-to-Character Mapping (reverse lookup) */
	67, 6, 78, 16, 86, 95, 34, 40, 45, 113, 117, 121, 62, 87, 18, 104, 41, 76, 57, 119, 115, 72, 97,
	2, 127, 26, 105, 35, 122, 52, 114, 7, 24, 82, 68, 63, 94, 44, 77, 112, 70, 100, 39, 30, 107,
	15, 125, 85, 10, 65, 54, 88, 20, 106, 46, 66, 8, 116, 29, 61, 99, 80, 90, 37, 123, 51, 25, 84,
	129, 56, 4, 109, 96, 28, 36, 47, 11, 71, 33, 102, 21, 9, 17, 49, 124, 79, 64, 91, 42, 69, 53,
	60, 14, 1, 27, 103, 126, 75, 89, 50, 120, 19, 32, 110, 92, 111, 130, 59, 31, 12, 81, 43, 55,
	5, 74, 22, 101, 128, 58, 118, 48, 108, 38, 98, 93, 23, 83, 13, 73, 3 };
	
/***************************************************************************
	** USPS_MSB_Math_CRC11GenerateFrameCheckSequence
	**
	** Inputs:
	**   ByteAttayPtr is the address of a 13 byte array holding 102 bytes which
	**   are right justified - ie: the leftmost 2 bits of the first byte do not
	**   hold data and must be set to zero.
	**
	** Outputs:
	**   return unsigned short - 11 bit Frame Check Sequence (right justified)
***************************************************************************/
extern unsigned short
		USPS_MSB_Math_CRC11GenerateFrameCheckSequence( unsigned char *ByteArrayPtr )

{
	unsigned short  GeneratorPolynomial = 0x0F35;
	unsigned short  FrameCheckSequence  = 0x07FF;
	unsigned short  Data;
	int             ByteIndex, Bit;

	/* Do most significant byte skipping the 2 most significant bits */
	Data = *ByteArrayPtr << 5;
	ByteArrayPtr++;
	for ( Bit = 2; Bit < 8; Bit++ )
	{
		if ( (FrameCheckSequence ^ Data) & 0x400 )
			FrameCheckSequence = (FrameCheckSequence << 1) ^ GeneratorPolynomial;
		else
			FrameCheckSequence = (FrameCheckSequence << 1);
		FrameCheckSequence &= 0x7FF;
		Data <<= 1;
	}
	/* Do rest of the bytes */
	for ( ByteIndex = 1; ByteIndex < 13; ByteIndex++ )
	{
		Data = *ByteArrayPtr << 3;
		ByteArrayPtr++;
		for ( Bit = 0; Bit < 8; Bit++ )
		{
			if ( (FrameCheckSequence ^ Data) & 0x0400 ) {
				FrameCheckSequence = (FrameCheckSequence << 1) ^ GeneratorPolynomial;
			} else {
				FrameCheckSequence = (FrameCheckSequence << 1);
			}
			FrameCheckSequence &= 0x7FF;
			Data <<= 1;
		}
	}
	return FrameCheckSequence;
}

void breakup(short int fcs_bit[], unsigned short usps_crc)
{
	int i;
	
	for(i = 0; i < 13; i++) {
		fcs_bit[i] = 0;
	}
	
	if(usps_crc >= 4096) {
		fcs_bit[12] = 1;
		usps_crc -= 4096;
	}
	if(usps_crc >= 2048) {
		fcs_bit[11] = 1;
		usps_crc -= 2048;
	}
	if(usps_crc >= 1024) {
		fcs_bit[10] = 1;
		usps_crc -= 1024;
	}
	if(usps_crc >= 512) {
		fcs_bit[9] = 1;
		usps_crc -= 512;
	}
	if(usps_crc >= 256) {
		fcs_bit[8] = 1;
		usps_crc -= 256;
	}
	if(usps_crc >= 128) {
		fcs_bit[7] = 1;
		usps_crc -= 128;
	}
	if(usps_crc >= 64) {
		fcs_bit[6] = 1;
		usps_crc -= 64;
	}
	if(usps_crc >= 32) {
		fcs_bit[5] = 1;
		usps_crc -= 32;
	}
	if(usps_crc >= 16) {
		fcs_bit[4] = 1;
		usps_crc -= 16;
	}
	if(usps_crc >= 8) {
		fcs_bit[3] = 1;
		usps_crc -= 8;
	}
	if(usps_crc >= 4) {
		fcs_bit[2] = 1;
		usps_crc -= 4;
	}
	if(usps_crc >= 2) {
		fcs_bit[1] = 1;
		usps_crc -= 2;
	}
	if(usps_crc == 1) {
		fcs_bit[0] = 1;
	}
}

int imail(struct zint_symbol *symbol, unsigned char source[], int length)
{
	char data_pattern[200];
	int error_number;
        int i, j, read;
        char zip[35], tracker[35], zip_adder[11], temp[2];
        short int accum[112], x_reg[112], y_reg[112];
        unsigned char byte_array[13];
        unsigned short usps_crc;
        int codeword[10];
        unsigned short characters[10];
        short int bit_pattern[13], bar_map[130];

	error_number = 0;

	if(length > 32) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(SODIUM, source, length);
    if(error_number == ERROR_INVALID_DATA1) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}
	
        strcpy(zip, "");
        strcpy(tracker, "");

        /* separate the tracking code from the routing code */
	
	read = 0;
	j = 0;
	for(i = 0; i < length; i++) {
		if(source[i] == '-') {
			tracker[read] = '\0';
			j = 1;
			read = 0;
		} else {
			if(j == 0) {
				/* reading tracker */
				tracker[read] = source[i];
				read++;
			} else {
				/* reading zip code */
				zip[read] = source[i];
				read++;
			}
		}
	}
	if(j == 0) {
		tracker[read] = '\0';
	} else {
		zip[read] = '\0';
	}
	
	if(strlen(tracker) != 20) {
		strcpy(symbol->errtxt, "Invalid length tracking code");
        return ERROR_INVALID_DATA1;
	}
	if(strlen(zip) > 11) {
		strcpy(symbol->errtxt, "Invalid ZIP code");
        return ERROR_INVALID_DATA1;
	}
	
	/* *** Step 1 - Conversion of Data Fields into Binary Data *** */
	
	/* Routing code first */
	
	for(i = 0; i < 112; i++) {
		accum[i] = 0;
	}
	
	for(read = 0; read < strlen(zip); read++) {

		for(i = 0; i < 112; i++) {
			x_reg[i] = accum[i];
		}
		
		for(i = 0; i < 9; i++) {
			binary_add(accum, x_reg);
		}
		
		x_reg[0] = BCD[ctoi(zip[read]) * 4];
		x_reg[1] = BCD[(ctoi(zip[read]) * 4) + 1];
		x_reg[2] = BCD[(ctoi(zip[read]) * 4) + 2];
		x_reg[3] = BCD[(ctoi(zip[read]) * 4) + 3];
		for(i = 4; i < 112; i++) {
			x_reg[i] = 0;
		}
		
		binary_add(accum, x_reg);
	}
	
	/* add weight to routing code */
	
	for(i = 0; i < 112; i++) {
		x_reg[i] = accum[i];
	}
	
	if(strlen(zip) > 9) {
		strcpy(zip_adder, "1000100001");
	} else {
		if(strlen(zip) > 5) {
			strcpy(zip_adder, "100001");
		} else {
			if(strlen(zip) > 0) {
				strcpy(zip_adder, "1");
			} else {
				strcpy(zip_adder, "0");
			}
		}
	}
	
	for(i = 0; i < 112; i++) {
		accum[i] = 0;
	}
	
	for(read = 0; read < strlen(zip_adder); read++) {

		for(i = 0; i < 112; i++) {
			y_reg[i] = accum[i];
		}
		
		for(i = 0; i < 9; i++) {
			binary_add(accum, y_reg);
		}
		
		y_reg[0] = BCD[ctoi(zip_adder[read]) * 4];
		y_reg[1] = BCD[(ctoi(zip_adder[read]) * 4) + 1];
		y_reg[2] = BCD[(ctoi(zip_adder[read]) * 4) + 2];
		y_reg[3] = BCD[(ctoi(zip_adder[read]) * 4) + 3];
		for(i = 4; i < 112; i++) {
			y_reg[i] = 0;
		}
		
		binary_add(accum, y_reg);
	}

	binary_add(accum, x_reg);
	
	/* tracking code */

	/* multiply by 10 */
	for(i = 0; i < 112; i++) {
		y_reg[i] = accum[i];
	}
		
	for(i = 0; i < 9; i++) {
		binary_add(accum, y_reg);
	}
	
	/* add first digit of tracker */
	y_reg[0] = BCD[ctoi(tracker[0]) * 4];
	y_reg[1] = BCD[(ctoi(tracker[0]) * 4) + 1];
	y_reg[2] = BCD[(ctoi(tracker[0]) * 4) + 2];
	y_reg[3] = BCD[(ctoi(tracker[0]) * 4) + 3];
	for(i = 4; i < 112; i++) {
		y_reg[i] = 0;
	}
		
	binary_add(accum, y_reg);
	
	/* multiply by 5 */
	for(i = 0; i < 112; i++) {
		y_reg[i] = accum[i];
	}
		
	for(i = 0; i < 4; i++) {
		binary_add(accum, y_reg);
	}
	
	/* add second digit */
	y_reg[0] = BCD[ctoi(tracker[1]) * 4];
	y_reg[1] = BCD[(ctoi(tracker[1]) * 4) + 1];
	y_reg[2] = BCD[(ctoi(tracker[1]) * 4) + 2];
	y_reg[3] = BCD[(ctoi(tracker[1]) * 4) + 3];
	for(i = 4; i < 112; i++) {
		y_reg[i] = 0;
	}
	
	binary_add(accum, y_reg);
	
	/* and then the rest */

	for(read = 2; read < strlen(tracker); read++) {

		for(i = 0; i < 112; i++) {
			y_reg[i] = accum[i];
		}
		
		for(i = 0; i < 9; i++) {
			binary_add(accum, y_reg);
		}
		
		y_reg[0] = BCD[ctoi(tracker[read]) * 4];
		y_reg[1] = BCD[(ctoi(tracker[read]) * 4) + 1];
		y_reg[2] = BCD[(ctoi(tracker[read]) * 4) + 2];
		y_reg[3] = BCD[(ctoi(tracker[read]) * 4) + 3];
		for(i = 4; i < 112; i++) {
			y_reg[i] = 0;
		}
		
		binary_add(accum, y_reg);
	}

	/* printf("Binary data 1: ");
	hex_dump(accum); */
	
	/* *** Step 2 - Generation of 11-bit CRC on Binary Data *** */

	accum[103] = 0;
	accum[102] = 0;
	
	memset(byte_array, 0, 13);
	for(j = 0; j < 13; j++) {
		i = 96 - (8 * j);
		byte_array[j] = 0;
		byte_array[j] += accum[i];
		byte_array[j] += 2 * accum[i + 1];
		byte_array[j] += 4 * accum[i + 2];
		byte_array[j] += 8 * accum[i + 3];
		byte_array[j] += 16 * accum[i + 4];
		byte_array[j] += 32 * accum[i + 5];
		byte_array[j] += 64 * accum[i + 6];
		byte_array[j] += 128 * accum[i + 7];
	}
	
	usps_crc = USPS_MSB_Math_CRC11GenerateFrameCheckSequence(byte_array);
	/* printf("FCS 2: %4.4X\n", usps_crc); */
	
	/* *** Step 3 - Conversion from Binary Data to Codewords *** */
	
	/* start with codeword J which is base 636 */
	for(i = 0; i < 112; i++) {
		x_reg[i] = 0;
		y_reg[i] = 0;
	}
	
	x_reg[101] = 1;
	x_reg[98] = 1;
	x_reg[97] = 1;
	x_reg[96] = 1;
	x_reg[95] = 1;
	x_reg[94] = 1;
	
	for(i = 92; i >= 0; i--) {
		y_reg[i] = islarger(accum, x_reg);
		if(y_reg[i] == 1) {
			binary_subtract(accum, x_reg);
		}
		shiftdown(x_reg);
	}
	
	codeword[9] = (accum[9] * 512) + (accum[8] * 256) + (accum[7] * 128) + (accum[6] * 64) +
			(accum[5] * 32) + (accum[4] * 16) + (accum[3] * 8) + (accum[2] * 4) +
			(accum[1] * 2) + accum[0];
	
	/* then codewords I to B with base 1365 */
	
	for(j = 8; j > 0; j--) {
		for(i = 0; i < 112; i++) {
			accum[i] = y_reg[i];
			y_reg[i] = 0;
			x_reg[i] = 0;
		}
		x_reg[101] = 1;
		x_reg[99] = 1;
		x_reg[97] = 1;
		x_reg[95] = 1;
		x_reg[93] = 1;
		x_reg[91] = 1;
		for(i = 91; i >= 0; i--) {
			y_reg[i] = islarger(accum, x_reg);
			if(y_reg[i] == 1) {
				binary_subtract(accum, x_reg);
			}
			shiftdown(x_reg);
		}
	
		codeword[j] = (accum[10] * 1024) + (accum[9] * 512) + (accum[8] * 256) +
				(accum[7] * 128) + (accum[6] * 64) + (accum[5] * 32) +
				(accum[4] * 16) + (accum[3] * 8) + (accum[2] * 4) +
				(accum[1] * 2) + accum[0];
	}
	
	codeword[0] = (y_reg[10] * 1024) + (y_reg[9] * 512) + (y_reg[8] * 256) +
			(y_reg[7] * 128) + (y_reg[6] * 64) + (y_reg[5] * 32) +
			(y_reg[4] * 16) + (y_reg[3] * 8) + (y_reg[2] * 4) +
			(y_reg[1] * 2) + y_reg[0];
	
	for(i = 0; i < 8; i++) {
		if(codeword[i] == 1365) {
			codeword[i] = 0;
			codeword[i + 1]++;
		}
	}

	/* printf("Codewords  3: ");
	for(i = 0; i < 10; i++) {
		printf("%d ", codeword[i]);
	}
	printf("\n"); */
	
	/* *** Step 4 - Inserting Additional Information into Codewords *** */
	
	codeword[9] = codeword[9] * 2;
	
	if(usps_crc >= 1024) {
		codeword[0] += 659;
	}
	
	/* printf("Codewords 4b: ");
	for(i = 0; i < 10; i++) {
		printf("%d ", codeword[i]);
	}
	printf("\n"); */
	
	/* *** Step 5 - Conversion from Codewords to Characters *** */
	
	for(i = 0; i < 10; i++) {
		if(codeword[i] < 1287) {
			characters[i] = AppxD_I[codeword[i]];
		} else {
			characters[i] = AppxD_II[codeword[i] - 1287];
		}
	}
	
	/* printf("Characters 5a: ");
	for(i = 0; i < 10; i++) {
		printf("%4.4X ", characters[i]);
	}
	printf("\n"); */

	breakup(bit_pattern, usps_crc);

	for(i = 0; i < 10; i++) {
		if(bit_pattern[i] == 1) {
			characters[i] = 0x1FFF - characters[i];
		}
	}
	
	/* printf("Characters 5b: ");
	for(i = 0; i < 10; i++) {
		printf("%4.4X ", characters[i]);
	}
	printf("\n"); */

	/* *** Step 6 - Conversion from Characters to the Intelligent Mail Barcode *** */
	
	for(i = 0; i < 10; i++) {
		breakup(bit_pattern, characters[i]);
		for(j = 0; j < 13; j++) {
			bar_map[AppxD_IV[(13 * i) + j] - 1] = bit_pattern[j];
		}
	}
	
	strcpy(data_pattern, "");
	temp[1] = '\0';
	for(i = 0; i < 65; i++) {
		j = 0;
		if(bar_map[i] == 0)
			j += 1;
		if(bar_map[i + 65] == 0)
			j += 2;
		temp[0] = itoc(j);
		concat(data_pattern, temp);
	}
	
	/* Translate 4-state data pattern to symbol */
	read = 0;
	for(i = 0; i < strlen(data_pattern); i++)
	{
		if((data_pattern[i] == '1') || (data_pattern[i] == '0'))
		{
			set_module(symbol, 0, read);
		}
		set_module(symbol, 1, read);
		if((data_pattern[i] == '2') || (data_pattern[i] == '0'))
		{
			set_module(symbol, 2, read);
		}
		read += 2;
	}

	symbol->row_height[0] = 3;
	symbol->row_height[1] = 2;
	symbol->row_height[2] = 3;

	symbol->rows = 3;
	symbol->width = read - 1;
	return error_number;
}
